A liquid mixture containing 30 mole% benzene,25% toluene,and the balance xylene is fed to distillation column.the bottoms product contains 98mole% xylene and no benzene and 96% of the xylene in the feed is recovered in this stream.the overhead product is fed to second column.the overhead product from the second column contain 97% benzene in the feed to this column.the composition of this stream is 94mole% of benzene and the balance toluene. A,draw flowchart, calculate degree of freedom,Molar flow rates and unknown process variable.

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